Piston-packing



(No Model.

A. BOYDEN.

PISTON PACKIN No. 342,819. Pa'tGn ted-Junel, 1886.

a WMABEIYDEN WITNESSES:

Attorney, 7

UNITED STATES \VILLIAM A. BOYDEN, OF BROOKLYN, NEYV YORK, ASSIGNOR OFONE-HALF TO JABEZ O. GILBERT, OF SAME PLACE.

.PISTON-PACKING.

SPECIFICATION forming part of Letters Patent No. 342,819, dated June 1,1886.

Application filed October 7, 1885.

To all whom it may concern:

Be it known that I, WILLIAM A. BOYDEN, a citizen of the United States,residing at Brooklyn, in the State of New York, have invented certainnew and useful Improvements in PistotrPackings, of which the followingis a specification, reference being had therein to the accompanyingdrawings.

My invention relates to improvements in piston-packings in which thepacking is set out automatically by means of spiral springs working in aplane at right angles to that in which the packing-ring moves. andacting thereon by means of a cut cylindrical ring I5 provided withpockets for the said springs,

and incline surfaces which coact with like incline surfaces on thespider or ribs of the piston, which, as the springs press thereon.expands the ring,'and thus sets the packing go out, the same beingillustrated in the accompanying drawings, in which Figure 1 is a frontview with the foll wer partly broken away, showing the interior of thehead; Fig. 2, a sectional view on line x, 2 and Fig. 3 a part sectionalview on line y.

Similar letters refer to similar parts th roughout the several views.

The letter A designates the plate that con-' 7 0 constructed in anydesired shape, with the ribs 12 at their ends formed at an angle, d,over which is placed the ring B, provided with counter inclineprojections e, which eoact with the said angles (1 to open the ring Bwhen pressed thereon, and the lugsf, which are provided with pockets 9,in which are placed the springs it, that press the ring 13 against theinclines, by which, as the pistonrings 2' wear away, they areautomatically set out as the ringB is cut at k, which permits it toexpand as it is forced on the angle surfaces d, thereby acting on theequalizing ring Z, which is also cut, and which equally ap-' plies theforce exerted on both the piston- 5 rings *5, which are constructed onwell-known principles.

The follower'plateOis constructed as usual,

and secured to the plate A by means of the Serial No. 179,183. (Nomodel.)

screws m, which pass through the plate 0 and are threaded into theribsb. The plate O is screwed hard against the surface a of the ribs 1) whenthe head is placed in the cylinder, which compresses the springs h, andthereby expands the ring B, as before stated, thus forcing thepiston-rings t against the interior of the cylinder, and continuing todo so automatically until they are entirely worn away, without anyattention from the attendants.

By the construction as above stated and shown, in case one of thesprings 'h should break or cease to act, the result would be the same,as the ring B would beexpanded by the action of the other springs,and/in case of such an accident none of the parts could become loose tocause rattling or interfering with the operation of the other parts;and, also, my improvement can be applied to the ordinary piston'head;the only alteration necessary is to turn off the ends of the ribs 1) toform the angle-surface d and provide the pocket-ring B, all the otherparts being reused, which re sults in a great saving, 8rd, especially soin locomotives, when adopting or applying a new device.

Having fully described my invention, whatI claim, and wish to secure byUnited States Letters Patent, is-

1. In a piston-packing, the combination of the plates A and O,the-former provided with ribs 1), having angular surfaces d, thecut-ring B, provided with.the pockets g and incline surfaces that coactwith the angular ones d, the springs h, and the packing-rings, as hereinset forth.

2. In combination with a piston-head provided with ribs having surfacesas described, the cut ring B, provided with pockets for springs, andincline surfaces, and the springs h, whereby the packing-rings areautomatically set out, as set forth. 9o

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM A. BOYDEN. \Vitnesses:

FREDERICK EDER, J ABEZ O. GILBERT.

